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Merge pull request #56 from flxo/pr-redis
Add a Redis cache variant
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| // Copyright 2016 Mozilla Foundation | ||
| // Copyright 2016 Felix Obenhuber <felix@obenhuber.de> | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| use cache::{ | ||
| Cache, | ||
| CacheRead, | ||
| CacheWrite, | ||
| Storage, | ||
| }; | ||
| use errors::*; | ||
| use futures::Future; | ||
| use futures_cpupool::CpuPool; | ||
| use redis::{ | ||
| cmd, | ||
| Client, | ||
| Commands, | ||
| Connection, | ||
| InfoDict, | ||
| }; | ||
| use std::collections::HashMap; | ||
| use std::io::Cursor; | ||
| use std::time::{ | ||
| Duration, | ||
| Instant, | ||
| }; | ||
|
|
||
| /// A cache that stores entries in a Redis. | ||
| #[derive(Clone)] | ||
| pub struct RedisCache { | ||
| url: String, | ||
| client: Client, | ||
| pool: CpuPool, | ||
| } | ||
|
|
||
| impl RedisCache { | ||
| /// Create a new `RedisCache`. | ||
| pub fn new(url: &str, pool: &CpuPool) -> Result<RedisCache> { | ||
| Ok(RedisCache { | ||
| url: url.to_owned(), | ||
| client: Client::open(url)?, | ||
| pool: pool.clone(), | ||
| }) | ||
| } | ||
|
|
||
| /// Returns a connection with configured read and write timeouts. | ||
| fn connect(&self) -> Result<Connection> { | ||
| self.client.get_connection() | ||
| .map_err(|e| e.into()) | ||
| .and_then(|c| { | ||
| c.set_read_timeout(Some(Duration::from_millis(10_000)))?; | ||
| c.set_write_timeout(Some(Duration::from_millis(10_000)))?; | ||
| Ok(c) | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| impl Storage for RedisCache { | ||
| /// Open a connection and query for a key. | ||
| fn get(&self, key: &str) -> SFuture<Cache> { | ||
| let key = key.to_owned(); | ||
| let me = self.clone(); | ||
| self.pool.spawn_fn(move || { | ||
| let c = me.connect()?; | ||
| let d = c.get::<&str, Vec<u8>>(&key)?; | ||
| if d.is_empty() { | ||
| Ok(Cache::Miss) | ||
| } else { | ||
| CacheRead::from(Cursor::new(d)) | ||
| .map(Cache::Hit) | ||
| } | ||
| }).boxed() | ||
| } | ||
|
|
||
| /// Initiate a cache write. There is nothing special needed | ||
| /// for the Redis cache. | ||
| fn start_put(&self, _key: &str) -> Result<CacheWrite> { | ||
| Ok(CacheWrite::new()) | ||
| } | ||
|
|
||
| /// Open a connecxtion and store a object in the cache. | ||
| fn finish_put(&self, key: &str, entry: CacheWrite) -> SFuture<Duration> { | ||
| let key = key.to_owned(); | ||
| let me = self.clone(); | ||
| self.pool.spawn_fn(move || { | ||
| let start = Instant::now(); | ||
| let c = me.connect()?; | ||
| let d = entry.finish()?; | ||
| c.set::<&str, Vec<u8>, ()>(&key, d)?; | ||
| Ok(start.elapsed()) | ||
| }).boxed() | ||
| } | ||
|
|
||
| /// Returns the cache location. | ||
| fn location(&self) -> String { | ||
| format!("Redis: {}", self.url) | ||
| } | ||
|
|
||
| /// Returns the current cache size. This value is aquired via | ||
| /// the Redis INFO command (used_memory). | ||
| fn current_size(&self) -> Option<usize> { | ||
| self.connect().ok() | ||
| .and_then(|c| cmd("INFO").query(&c).ok()) | ||
| .and_then(|i: InfoDict| i.get("used_memory")) | ||
| } | ||
|
|
||
| /// Returns the maximum cache size. This value is read via | ||
| /// the Redis CONFIG command (maxmemory). If the server has no | ||
| /// configured limit, the result is None. | ||
| fn max_size(&self) -> Option<usize> { | ||
| self.connect().ok() | ||
| .and_then(|c| cmd("CONFIG").arg("GET").arg("maxmemory").query(&c).ok()) | ||
| .and_then(|h: HashMap<String, usize>| h.get("maxmemory").map(|s| *s)) | ||
| .and_then(|s| { | ||
| if s != 0 { | ||
| Some(s) | ||
| } else { | ||
| None | ||
| } | ||
| }) | ||
| } | ||
| } |
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